Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccbc2a8a3b5ff522…

MALICIOUS

PDF

81.6 KB Created: 2021-07-16 05:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 20df21caee5f91e69cd0851bfc3f3350 SHA-1: c322bf85749f6beb35b456b602dd75989bc4073b SHA-256: ccbc2a8a3b5ff522d04632de429207bdccafd8fafb728bbc7dd4ad621d28eef1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The presence of external URI heuristics and link farm detection rules further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=lymphoid+organs+and+tissues PDF link annotation
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/41e07f168a899fa4612b4cdd89031d2b/nomojudopa.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/tazukozobupu.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/xuwolebavasokilax.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210610042414_buszfl.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/7cc3a4f28dd1eda355f7cebae055eee7/wefegewiposaponomipegener.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/90225904849.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/16852601656.pdfIn PDF document text
    • https://liffeyartefacts.com/fckimagefile/file/surekifag.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/065d4efa239195f619518a3339d5f6e9/sikutitedudotuka.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///mejujasef.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/belabu.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/60911913003.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/zadanobivonamobanininobaf.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/0fe7b57b6e61b6d0d016c5fefa6ad509/vaxuziwomituretez.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607da79384c1d---25937930534.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/o4j15tnmmtvlllb3v0fips8g03/40637645105.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/67417516690.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3bf95d0ee---bubazifotifabawogadanir.pdfIn PDF document text
    • https://eternalbliss.net/file/logujapej.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e740ef55f---74632184474.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/e4918eb4cb3f6337536c55825d46027b/85660028855.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/58341747080.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE088 10964 bytes
SHA-256: eab58c737f6b08bc80b66fb027418d58e1cf93cc2d7ce20041dd3c8f4d70d32d
font_01_sfnt_off0000f9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B2 15696 bytes
SHA-256: 7ac8fa46ef1a9c44593943f863eecec998bc8dbf2eb7878ee2b96066de419660

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